Die-threading machine.



W. H. POTTER & J. E. BENSON DIE THREADING MACHINE APPUcATmN mw APR. 6,1914.

1,137,020. Pamnte Apr. 2z, 1915.

4 SHEETS-SHEET l.

l ATToRNEs/s.

W PONER & L E, BENSON. m5 HREADING MACHrNE.

4 SHEETS-SHEET 2.

W. H. POTTER 6L E. BENSON. DIE THREADING MACHINE.

' APPLICATION FILED APR. 6,1914. 1 ,137,020, Patented Apr. 27, 1915.

4 SHEETS-SHEET 3.

W. H. POTTER @1.5. BENSON. DIE THREADING MACHINE.

APPLICATION I'LED APR. 5, 19H. N l V 1,137,020. lnvnttcu Apr. 2., heb.

, 'narran sfr-Arne ienrnivr ornion.

WILLIAM POTTER AND JOHNjEiBESON,

OF CHICAGO, ILLNOIS, AVSSIGNORS TD THE NYE TOOL AND `MACHINE WORKS, OF CHICAGO, ILLINOIS, CORPORATION 0F rumors.

Tr; arl-Z 'zr/ion; may concern.' -1

Be it known that we, TILLmM'-I. 'Porrrrr. and JOHN E. BENSON, residing `at Chicago, in the county otC-oolr and State/o1 Illinois, both citizens ofthe United States, have invented a certain new and useful 1mprovement in Die-Threadiug Machines, of which the following is a specification.

Our invention. relates to dieI threading,r machines and. the general object of the invention is to provide a machine byfthe aid of which threads may be formed very accurately upon the die; also to provide asmachine/ in which a full range 'of adjustments is vpossible so 4that the adapted to cut dies of va cut dies in which the blades or' chasers are set either 'parallel to the axis''r 'obliquely thereto in the manner referred to in the trade as"on the spiral.

Another object is to provide a consti-'uction which will result in great rigiditylof. 'theparts Vwithout makingthern unnecessarily heavy enlarge. v

'These vgenerall objects are obtained a's a' result of a number of specifici characteristics which vwill be hereinafter more particularly described and claimed, and are illiist-rated 1n the* accompanying drawings in which-,v

F ig'ure'l is a plan 'view .of the assembled machine. 'Figa 2 is a'vertical section there-J of on the line 2--2, Fig. 1.` Fig. 3 is 'a top plan `view of the lead block, dieholder and associated parts.k Fig. 4' is a bottom plan `view of the 'hob carrier and partsforvdriving the hob and adjustingittocut dies `of different diameters. j Fg is a .detail in plan "showing one portion of -`thedie holder. Fig. t' 'is a fr on`t elevation of' the parts shown-in ig. 5. Figa? is a planviewzot'the latchnechanism for locking 'the' dieiholder being-ut upon -any while l the thread. is

showing the chasers acting upon n" pipe, this view .i-llustrating the desirability of raken or clearance up'onlt-he-chasersv Fiis.v 9 and 10 are sectional lelevations showing de tails of 'the hitch a# themeans for adjusting the 'latch upon planes of.' section inthe two views arev at' right angles to each o .then4 the plane of secnon ef.' Fig. ebeing mamma Aby the 1in-e 9-9 inFig. 1G.

Specification of Letters Patent.

machine may be rions sizes and to shaft journaled in suitable 1 This shaft is driven by a the lead-'b lock., r1.-"he

EXE-THREADIN G MACHINE.

Patented Apr. 2 7, 1915. 1914. serial Nn. 829,716.

'Similar numerals refer to similar throughout the several views.

.The bed plate or stationary part of the machine consists of a able outline. supported upon a number of legs 2. This block has a central aperture having an internal screw thread 3 which coperateswith an external screw thread 4 formed upon the sides of the lead block 5. The threaded parts table 1 of any suit- In the present instance this is surfaces 3 and 4 form a lead screw for the lead block sothat the latter will progress in van. axial direction (vertical instance) when rotated by block by said handle 6.

in the present 5 means of the handle 6. Ours may be termed a. hand feed v machine, and the feeding of the work tothe. 'hob is accomplished by rotating the lead-- In 0111' machine, as here illustrated,.ithe' axis of the hob remains stationaryso long as.

the machine is operating on dies of any given"l 4 diameter; in other words, the axis lof =the hoh is shifted only of various sit/zes', the'hob carrier and means whereby the hob is driven and adjusted.

The heb 8 is `located at the upper ex.-

to. adjust the hob todies 1;; and We Will Hrst .describe-2 tl'remity of a spindle 9 journalediin the upf'` n .standing-hose best shown in `otally attached to the Vunder side` of .thel

lOrising from the'plate Ilya-sq. Figs. 2 and 4. Sajd'platecom g vstitutes an adjusting vsegment and is pivtable by a fulcruznjstud 12. Said se mente.

may be rotated about 'It has slots 14, vthrough' which pass set screws 15. Said set screws may be tightened by nuts 16, one of which is operated by handle 17, as'shown-in By adjusting the segment the hobv Fig. 1. 4may be adjusted closer to or farther. from its pivot hyhan le preferably two in number,

the central axis of the lead block to produce n dies of different diameterq- The hob is' r0 -j Y tated by a gear 2O at its lower end meshing' with a worm 21 rigidly secured to afdrive .jr y

mounted on the under side of the segment. band wheel24 or .equivalent-.power device.

13 are adjustable stops which On opposite-sides of the segment'handle consist` .of j .screws 25 mounted in lugs 26.l Thesestops enable the operator to quickly bring the segff10L ment to a previously determined position.

The boss 10 .in which the spindle 9 is journaled passes up through a central opening 5a in the lead' block 5 and through a central openingl 30 in the die holder block 30, Said die holder block is externally threaded and screws into the central opening of the lead block. The means for securing the die to the die holder block are the operator simply-grasping the shown in "detail in Figs. 5 and 6. In the form illustrated the holder blockA is provided with two lugs 32 in which are mounted set screws 33. These screws are adapted lto press against two adjacent sides of the die, said die consisting of the body 341-,and the chasers 35. The die is shown separately in Fig. 8 and is shown in position in the die holder in Fig. 3. The set screws 33 force the die against two -blocks 37 which are adjustably mounted in housings 38, these latter parts being show'n separately in Figs. 5 and 6. Said housings are secured preferably by screws `,39 Aassisted'by vdowels 40. The blocks are lon `tudinally slotted and are adjustablyA he dv by set screws 41 so that the blocks may be retained in the proper position to hold the die accurately centered.

There are usually four chasers to'a die, and the die holder must be indexed to bring the different chasers to the hob. The

indexing-that is the actual rotating of the die holder in the leadblockis done b'l-hand, u `e and giving it a quarter turn, .The latching means for holding the die holder duringthe operation of threading gany' --particular chaser will now be described,v 4 Y.

The die holder has Afour-notches 45 iinits periphery, these being located 'S05-:degrees apart and adapted to4 receive the noseof a -dog or latch 46. This-latch iis longitudinally j slidable in a housing47, and is operated -by a hand lever 48 ful'crumed'` upon-va pin 49 vv'mounted- .in the block.. These parts-aireshown in detail in Figs. 7, v9-and 10. This rlatch mechanism is adjustable along4 an arc concentric with the AAaxis o f the .de holder, the result being that thel clearance produced -on the Chaser may be regulated. In lthe present construction, a circular-'T slot 50 is formed in the .upper surface of .the lead block 5. This slot is enlarged at the oint 51 for'the insertion ofthe" head 520i r olts- 53 which pass up' throughthe, housing47. Consequently, thehousing is circularly slidable but may be set at any desired point by screwing up theA nuts 54 at thel upper end of the bolts 53. l

The boss 10 on the segmentA 11 is Aso formed that the axis of the hob is not pref cisely vertical but-is inclined slightly (usu- -ally less than one degree) so that'the path of the hob teeth while in contact with tlieA chaser wll'conform to the pitch of the- "a fresh notch 45.

After this adjustmentordinarily, until dies of a different diameter are wanted. The die holder latch 46 is then adjusted in the slot 50 to such position as to produce the desired amount of clearance in the4 chaser. This adjustment will also remain undisturbed until dies of a different. v

style or size are to be made. blank die is fastened in the die holder by the aid of the set screws 33. The die holder is then rotated until one of the notches 45 therein comes opposite upon the latch is inserted and the die holder is held fast. Next, the operator-feeds the Next, the Y to the latch where-vv die, to the hob by grasping the handle 6 and rotating the lead block 5, thereby bringing the end of the chaser gradually past the rotating hob and causing the Alatter to form the teeth on the chaser. W'hen this cutting operation is finished the operator indexes the holder-that is, he operates the lever 48 to withdraw the latch 46 and release the die holder. He then gives the die holder a, quarter turn and causes the latch to Venter At the same time he moves the handle 6 in the reverse direction to return itl and the lead block to initiall position. He thereupon proceeds tofeed the die forward again so as to bring the new Vchaser across the rotating hob to produceA the teeth upon the chaser. .This operationv of indexing the die and then feeding it for-v 'wardj for the cutting operation is repeated Vuntil the teeth are Vformed upon all four of the chasers It will. be evident that our machine is wide range of adjustment. The segment-11,

'-contacting' as it does, theA table at three jsimple in design, compact, -and affords a.

and the boss wherein it is journaled occupy' a position within the body, so to speak, of the die holder and lead block.' The result is that the application 'of the force'of the hob-is clos'e to the point where the driving poweris applied to the spindle; in lother words the spindle is short and is journaled in strong and substantial bearings. An-

other advantage in our construction results f ifrom the fact that the hob spindle and parts 'which drive the same are beneath the sur# 'face of ythe'table, thus affording a clear "paee above the table and enabling the op'- at its circumference, a sliding latch for entering said recesses for indexing the die holder, a housing in which said latch is slidable, circular ways concentric with the j, die holder and located on the lead block for guiding said housing, and means for fastening said housing at the desired point of said ways.

In Witness whereof, we have hereunto sul)u scribed our names in the presence of two ilu Witnesses. i

WILLIAM H. POTTER. v JOHN E BENSON. W'itnesses:

KATHRYx S. READY, M.. S. RosENzw'E-io. 

